P18_028 - 28. (a) The intensity is I= P 30.0 W 2 = = 5.97...

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28. (a) The intensity is I = P 4 πr 2 = 30 . 0W (4 π )(200 m) 2 =5 . 97 × 10 5 W / m 2 . (b) Let A (= 0 . 750 cm 2 ) be the cross-sectional area of the microphone. Then the power intercepted by
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